<!DOCTYPE html>
<html lang="zh-CN">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>404 - 页面未找到</title>
    <style>
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
        }
        
        body {
            background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
            min-height: 100vh;
            display: flex;
            justify-content: center;
            align-items: center;
            padding: 20px;
        }
        
        .container {
            text-align: center;
            background-color: white;
            border-radius: 15px;
            padding: 40px;
            box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
            max-width: 500px;
            width: 100%;
            animation: fadeIn 0.8s ease-out;
        }
        
        .error-code {
            font-size: 120px;
            font-weight: 700;
            color: #ff6b6b;
            line-height: 1;
            margin-bottom: 10px;
            text-shadow: 3px 3px 0 rgba(0, 0, 0, 0.1);
        }
        
        .error-message {
            font-size: 24px;
            color: #333;
            margin-bottom: 20px;
            font-weight: 500;
        }
        
        .error-details {
            color: #666;
            margin-bottom: 30px;
            line-height: 1.6;
        }
        
        .home-button {
            display: inline-block;
            background: #4dabf7;
            color: white;
            padding: 12px 30px;
            border-radius: 50px;
            text-decoration: none;
            font-weight: 600;
            transition: all 0.3s ease;
            box-shadow: 0 4px 15px rgba(77, 171, 247, 0.3);
        }
        
        .home-button:hover {
            background: #339af0;
            transform: translateY(-2px);
            box-shadow: 0 6px 20px rgba(77, 171, 247, 0.4);
        }
        
        .animation-container {
            margin: 30px 0;
            display: flex;
            justify-content: center;
        }
        
        .error-icon {
            width: 100px;
            height: 100px;
            position: relative;
            animation: bounce 2s infinite;
        }
        
        .error-icon:before, .error-icon:after {
            content: '';
            position: absolute;
            width: 100%;
            height: 15px;
            background-color: #ff6b6b;
            top: 50%;
            left: 0;
            border-radius: 5px;
        }
        
        .error-icon:before {
            transform: translateY(-50%) rotate(45deg);
        }
        
        .error-icon:after {
            transform: translateY(-50%) rotate(-45deg);
        }
        
        @keyframes fadeIn {
            from { opacity: 0; transform: translateY(20px); }
            to { opacity: 1; transform: translateY(0); }
        }
        
        @keyframes bounce {
            0%, 20%, 50%, 80%, 100% { transform: translateY(0); }
            40% { transform: translateY(-10px); }
            60% { transform: translateY(-5px); }
        }
        
        @media (max-width: 480px) {
            .container {
                padding: 30px 20px;
            }
            
            .error-code {
                font-size: 80px;
            }
            
            .error-message {
                font-size: 20px;
            }
        }
    </style>
</head>
<body>
    <div class="container">
        <div class="error-code">404</div>
        <div class="animation-container">
            <div class="error-icon"></div>
        </div>
        <div class="error-details">
            抱歉，您要访问的页面不存在或已被移除。<br>
            请检查URL是否正确，或返回首页。
        </div>
        <a href="./index.html" class="home-button">返回首页</a>
    </div>
</body>
</html>